That's correct, an attached JADU and detached ADU. Each unit does not have a separate utility meter, so the plan is to charge a set fee to each tenant for water, electricity and gas. We are putting solar on the ADU, which should offset most of the electrical use. I started helping with this project midstream, so some decisions I'll have to live with. For example, not having separate meters. I'm not even sure that was an option, or maybe it was just too expensive.
The part that makes this slightly more complicated is converting the residence from single family to 3 units. There's a lot to consider with the possibility of 3 families living. I'd be happy to share as we make more progress. It certainly is one investment option for San Diego, since the cost of housing here has gotten a little out of hand.
As far as return on investment, I'm working on this with a family member, so he may decide to live in one of the three units or rent out all of them. Here's a breakdown.
Main house - 850 sqft 2 bed 1 bath w/garage and nice size front and back yard.
Detached ADU - 950 sqft 2 bed 2 bath, shared driveway parking, large upper section of back yard.
Attached JADU - 220 sqft 1 bed 1 bath, kitchenette, separate driveway, side and back yard.
I would say a rough guess on rent is
Main house: $2200/month
Detached ADU: $2400/month
Attached JADU: $1000/month
But we'll have to see.